Polymer mixture containing an amorphous polyolefin which contain cycloaliphatic olefins

ABSTRACT

The present invention describes a novel transparent polymer mixture with modified relaxation behavior and modified shrinkage behavior, comprising cycloolefin polymers. The polymer mixture comprises at least one amorphous polyolefin. The polymer mixture is used to produce mono- or biaxially oriented films, blister packs, or mixtures with other plastics, particularly with polyolefins. The polymer mixture is used in injection molding, injection blow molding or blow extrusion.

[0001] The present invention relates to a novel transparent polymermixture with modified relaxation behavior and modified shrinkagebehavior, comprising cycloolefin polymers.

[0002] The relaxation behavior of polymers is a description of change inmodulus of elasticity as a function of temperature and frequency. Therelaxation behavior of a cycloolefin polymer or of a known cycloolefinmixture exhibits a steep fall-off in modulus of elasticity within anarrow temperature range, what is known as the glass transition range orsoftening range.

[0003] Shrinkage behavior is a description of the change in length ofmono- or biaxially oriented test specimens as a function of temperatureor time.

[0004] Delfolie et al., Macromolecules 32, 1999, 7781-7789, studies themiscibility of ethylene-norbornene copolymers. DSC is used to indicatethe limits of miscibility: the occurrence of a single glass transitiontemperature is regarded as a measure of miscibility, while immiscibilityis apparent in the occurrence of two separate glass transitions.

[0005] Utracki, Polymer Alloys and Blends—Thermodynamics and Rheology,2^(nd) edition, Munich, Hanser 1989, 3 et seq., gives a generaldescription of modulus of elasticity as a function of temperature for50/50 polymer mixtures in the vicinity of the glass transitiontemperature. For homogeneously miscible polymers, a steep fall-off inthe modulus is found at a central glass transition temperature. Forimmiscible polymers, two steps in the modulus of elasticity, andtherefore two glass transition temperatures, are observed, correspondingto those of the starting materials. For partially miscible polymers, twosteps in the modulus of elasticity, and therefore two glass transitiontemperatures, are observed, and are slightly different from those of thestarting materials. For immiscible polymers with fine dispersion below15 nm, referred to as compatible polymers, a broad glass transitiontemperature range is found, with a slight fall-off in the modulus ofelasticity.

[0006] Hsiue and Ye, J. Appl. Pol. Sci. 37, 1989, 2803-2836, describethe shrinkage behavior of oriented polyester films above the glasstransition temperature. It is shown that shrinkage behavior of amorphouspolymers in this range is determined by the degree of intertwining ofthe polymer chains. An increase in the molecular weight and a loweringof the orientation temperature lead to greater shrinkage.

[0007] U.S. Pat. No. 5,824,398 and U.S. Pat. No. 5,589,126 indicate thataddition of a plasticizer to polyester shifts the temperature ofshrinkage onset in oriented films to lower temperatures.

[0008] A substantial disadvantage of the steep fall-off in the modulusof elasticity with temperature is that there is only a narrow possibletemperature range for the elongation of test specimens. This isrelevant, for example, in the case of mono- or bi-axial orientation offilms. The steep fall-off in modulus of elasticity as a function oftemperature also brings about rapid change in the shrinkage of orientedfilms with temperature. As a result, the films produced giveunsatisfactory results when shrunk onto irregularly shaped testspecimens. The marked change in length of oriented test specimens withtemperature acts together with a high degree of intertwining of thepolymer chains to exert a strong shrinkage force on the test specimen,and if wall thickness is low this can lead to undesired volume change.There has therefore been a longstanding desire to find a way ofinfluencing the temperature-dependency of modulus of elasticity in theglass transition region, and of shrinkage, while at the same timeretaining transparency.

[0009] The object of the present invention is to provide a noveltransparent polymer mixture, comprising cycloolefin polymers, withmodified relaxation behavior and modified shrinkage behavior.

[0010] The object of the present invention is achieved by way of apolymer mixture comprising at least one amorphous polyolefin.Surprisingly, addition of an amorphous polyolefin brings about anunexpected change in the modulus of elasticity and in the shrinkagebehavior in relation to temperature.

[0011] The mixture of the invention preferably comprises at least onecycloolefin polymer. Addition of at least one amorphous polyolefin tothe cycloolefin polymer brings about good results in terms of change inmodulus of elasticity and in shrinkage behavior in relation totemperature.

[0012] The mixture of the invention preferably comprises at least oneamorphous cycloolefin polymer. Addition of at least one amorphouscycloolefin polymer to a cycloolefin polymer brings about particularlygood results in terms of change in modulus of elasticity and inshrinkage behavior in relation to temperature.

[0013] The mixture of the invention comprises at least one cycloolefinpolymer, containing from 0.1 to 100% by weight, preferably from 0.1 to99.9% by weight, based on the total weight of the cycloolefin copolymer,of polymerized units which derive from at least one polycyclic olefin ofthe formulae I, II, II′, III, IV, V or VI

[0014] where R¹, R², R³, R⁴, R⁵, R⁶, R⁷, and R⁸ are identical ordifferent and are a hydrogen atom or a C₁-C₂₀-hydrocarbon radical, suchas a linear or branched C₁-C₈-alkyl radical, C₆-C₁₈-aryl radical,C₇-C₂₀-alkylene-aryl radical, or a cyclic or acyclic C₂-C₂₀-alkenylradical, or form a saturated, unsaturated, or aromatic ring, where thesame radicals R¹ to R⁸ in the various formulae I to VI may have adifferent meaning, and where n can assume values from 0 to 5, andcontaining from 0 to 99.9% by weight, preferably from 0.1 to 99.9% byweight, based on the total weight of the cycloolefin copolymer, ofpolymerized units which derive from one or more acyclic olefins of theformula VII

[0015] where R⁹, R¹⁰, R¹¹, and R¹² are identical or different and are ahydrogen atom, or a linear or branched, saturated or unsaturatedC₁-C₂₀-hydrocarbon, radical, such as a C₁-C₈-alkyl radical or aC₆-C₁₈-aryl radical.

[0016] The cycloolefin copolymers used according to the invention maymoreover contain from 0 to 45% by weight, based on the total weight ofthe cycloolefin copolymer, of polymerized units which derive from one ormore monocyclic olefins of the formula VIII

[0017] where m is a number from 2 to 10.

[0018] The cyclic olefins likewise include derivatives of these cyclicolefins having polar groups, such as halogen groups, hydroxy groups,ester groups, alkoxy groups, carboxy groups, cyano groups, amido groups,imino groups, or silyl groups.

[0019] For the purposes of the invention, preference is given tocycloolefin copolymers which contain polymerized units which derive frompolycyclic olefins of the formulae I or III, and contain polymerizedunits which derive from acyclic olefins of the formula VII.

[0020] Particular preference is given to cycloolefin copolymers whichcontain polymerized units which derive from olefins with underlyingnorbornene structure, very particularly preferably from norbornene andtetracyclo-dodecene, and, where appropriate, vinylnorbornene ornorbornadiene.

[0021] Particular preference is also given to cycloolefin copolymerswhich contain polymerized units which derive from acyclic olefins havingterminal double bonds, such as α-olefins having from 2 to 20 carbonatoms, very particularly preferably ethylene or propylene. Very greatpreference is given to norbornene-ethylene copolymers andtetracyclododecene-ethylene copolymers.

[0022] Among the terpolymers, particular preference is given tonorbornene-vinyl-norbornene-ethylene terpolymers,norbornene-norbornadiene-ethylene terpolymers,tetracyclododecene-vinyinorbornene-ethylene terpolymers,tetracyclododecene-vinyltetracyclododecene-ethylene terpolymers, andnorbornene-dicyclopentadiene-ethylene. The proportion of the polymerizedunits which derive from a polyene, preferably vinylnorbornene ornorbornadiene, is from 0.1 to 50 mol %, preferably from 0.1 to 20 mol %,and the proportion of the acyclic monoolefin of the formula VII is from0 to 99.9 mol %, preferably from 5 to 80 mol %, based on the totalmakeup of the cycloolefin polymer. In the terpolymers described, theproportion of the polycyclic monoolefin is from 0.1 to 99.9 mol %,preferably from 3 to 75 mol %, based on the total makeup of thecycloolefin polymer.

[0023] EP-A-317262 describes other suitable polymers. Hydrogenatedpolymers and copolymers, such as those of styrene or dicyclopentadieneand of other amorphous polyolefins, are expressly also suitable.

[0024] Blends of these polymers with typical plastics additives, such asantioxidants, metal deactivators, light stabilizers, plasticizers,lubricants, processing aids, antistats, optical brighteners,biostabilizers, flame retardants, pigments, dyes, and also fillers andreinforcing agents (see also Gächter, Müller, Plastics AdditiveHandbook, 4^(th) edition, 1993, Munich, Hanser) are expressly alsosuitable.

[0025] The cycloolefin copolymers used according to the invention may beprepared at temperatures of from −78 to 200° C. and at a pressure offrom 0.01 to 200 bar in the presence of one or more catalyst systemswhich comprise at least one transition metal compound and, whereappropriate, comprise a cocatalyst and, where appropriate, a supportmaterial. Suitable transition metal compounds are metallocenes, inparticular stereorigid metallocenes. Examples of catalyst systems whichare suitable for producing the cycloolefin copolymers of the inventionare described in U.S. Pat. No. 5,008,356, EP-A-0 407 870, EP-A-0 485893, and EP-A-0 503 422. These references are expressly incorporatedherein by way of reference. The disclosure of these references istherefore a constituent of the present patent application.

[0026] Examples of transition metal compounds used are:

[0027] rac-dimethylsilylbis(1-indenyl)zirconium dichloride,

[0028] rac-dimethylgermylbis(1-indenyl)zirconium dichloride,

[0029] rac-phenylmethylsilylbis(1-indenyl)zirconium dichloride,

[0030] rac-phenylvinylsilylbis(1-indenyl)zirconium dichloride,

[0031] 1-silacyclobutylbis(1-indenyl)zirconium dichloride,

[0032] rac-diphenylsilylbis(1-indenyl)hafnium dichloride,

[0033] rac-phenylmethylsilylbis(1-indenyl)hafnium dichloride,

[0034] rac-diphenylsilylbis(1-indenyl)zirconium dichloride,

[0035] rac-ethylene-1,2-bis(1-indenyl)zirconium dichloride,

[0036] dimethylsilyl-(9-fluorenyl)(cyclopentadienyl)zirconiumdichloride,

[0037] diphenylsilyl-(9-fluorenyl)(cyclopentadienyl)zirconiumdichloride,

[0038] bis(1-indenyl)zirconium dichloride,

[0039] diphenylmethylene-(9-fluorenyl)cyclopentadienylzirconiumdichloride,

[0040] isopropylene-(9-fluorenyl)cyclopentadienylzirconium dichloride,

[0041] rac-isopropylidenebis(1 -indenyl)zirconium dichloride,

[0042] phenylmethylmethylene-(9-fluorenyl)cyclopentadienylzirconiumdichloride,

[0043]isopropylene-(9-fluorenyl)(1-(3-isopropyl)cyclopentadienyl)zirconiumdichloride,

[0044] isopropylene-(9-fluorenyl)(1-(3-methyl)cyclopentadienyl)zirconium dichloride,

[0045]diphenylmethylene-(9-fluorenyl)(1-(3-methyl)cyclopentadienyl)zirconiumdichloride,

[0046]methylphenylmethylene-(9-fluorenyl)(1-(3-methyl)cyclopentadienyl)-zirconiumdichloride,

[0047]dimethylsilyl-(9-fluorenyl)(1-(3-methyl)cyclopentadienyl)zirconiumdichloride,

[0048]diphenylsilyl-(9-fluorenyl)(1-(3-methyl)cyclopentadienyl)zirconiumdichloride,

[0049]diphenylmethylene-(9-fluorenyl)(1-(3-tert-butyl)cyclopentadienyl)zirconiumdichloride,

[0050]isopropylene-(9-fluorenyl)(1-(3-tert-butyl)cyclopentadienyl)zirconiumdichloride,

[0051] isopropylene(cyclopentadienyl)(1-indenyl)zirconium dichloride,

[0052] diphenylcarbonyl(cyclopentadienyl)(1-indenyl)zirconiumdichloride,

[0053] dimethylsilyl(cyclopentadienyl)(1-indenyl)zirconium dichloride,

[0054] isopropylene(methylcyclopentadienyl)(1-indenyl)zirconiumdichloride,

[0055][4-(η⁵-cyclopentadienyl)-4,7,7-trimethyl(η⁵-4,5,6,7-tetrahydroindenyl)]-zirconiumdichloride,

[0056][4-(η⁵-cyclopentadienyl)-4,7,7-triphenyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0057][4-(η⁵-cyclopentadienyl)-4,7-dimethyl-7-phenyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0058][4-(η⁵-5-3′-tert-butylcyclopentadienyl)-4,7,7-triphenyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0059] [4-(η⁵-3′-tert-butylcyclopentadienyl)-4,7-dimethyl-7-phenyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0060][4-(η⁵-3′-methylcyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0061][4-(η⁻3′-methylcyclopentadienyl)-4,7,7-triphenyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0062][4-(η⁵-3′-methylcyclopentadienyl)-4,7-dimethyl-7-phenyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0063][4-(η⁵-3′-isopropylcyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0064] [4-(η⁵-3′-isopropylcyclopentadienyl)-4,7,7-triphenyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0065][4-(η³′-isopropylcyclopentadienyl)-4,7-dimethyl-7-phenyl-(η⁵-4,5,6,7-tetrahydroindenyl)]zirconiumdichloride,

[0066] [4-(η⁵-cyclopentadienyl)(η⁵-4,5-tetrahydropentalene)]zirconiumdichloride,

[0067][4-(η⁵-cyclopentadienyl)-4-methyl(η⁵-4,5-tetrahydropentalene)]zirconiumdichloride,

[0068][4-(η⁵-cyclopentadienyl)-4-phenyl(η⁵-4,5-tetrahydropentalene)]zirconiumdichloride,

[0069][4-(η⁵-cyclopentadienyl)-4-phenyl(η⁵-4,5-tetrahydropentalene)]zirconiumdichloride,

[0070][4-(η⁵-3′-methylcyclopentadienyl)(η⁵-4,5-tetrahydropentalene)]zirconiumdichloride,

[0071][4-(η⁵-3′-isopropylcyclopentadienyl)(η⁵-4,5-tetrahydropentalene)]zirconiumdichloride,

[0072][4-(η⁵-3′-benzylcyclopentadienyl)(η⁵-4,5-tetrahydropentalene)]zirconiumdichloride,

[0073][2,2,4-trimethyl-4-(η⁵-cyclopentadienyl)(η⁵-4,5-tetrahydropentalene)]-zirconiumdichloride, [2,2,4-trimethyl-4-(-(3,4-diisopropyl)cyclopentadienyl)(η⁵-4,5-tetrahydropentalene)]zirconiumdichloride.

[0074] The cycloolefin copolymers can also be prepared by other routesbriefly outlined below: catalyst systems based on mixed catalysts madefrom titanium salts and from aluminum organyl compounds are described inDD-A-109 224 and DD-A-237 070. EP-A-0 156464 describes the preparationprocess using vanadium-based catalysts.

[0075] The cycloolefin copolymers may also be prepared by ring-openingpolymerization of at least one of the monomers having the formulae I toVI and then hydrogenation of the resultant products.

[0076] The polymerization may also take place in two or more stages, andthe products may also be block copolymers (DE-A-42 05 416).

[0077] Cycloolefin copolymers are preferably amorphous, transparentmaterials. The heat resistances of cycloolefin copolymers may beadjusted within a wide range. As a guideline for heat resistance, as maybe determined on injection moldings to ISO 75 Part 1 and Part 2, theglass transition temperature may be utilized in the case of cycloolefincopolymers, as measured by DIN EN ISO 11357-1 with the aid of DSC. Thecycloolefin copolymers described have glass transition temperatures offrom −50 to 250° C. Preference is given to glass transition temperaturesbetween 0 and 220° C, particularly glass transition temperatures between40 and 200° C.

[0078] The average molar mass of the cycloolefin copolymers may bevaried via hydrogen feed, variation in catalyst concentration, orvariation in temperature, in a known manner. The cycloolefin copolymershave weight-average molar masses Mw of from 1,000 to 10,000,000 g/mol.Preference is given to weight-average molar masses Mw of from 5,000 to5,000,000 g/mol, particularly to weight-average molar masses Mw of from5,000 to 1,200,000 g/mol. These molar masses determined with the aid ofgel permeation chromatography (GPC) in chloroform at 35° C. with the aidof an R₁detector are relative molar masses based on calibration usingnarrowly distributed polystyrene standards.

[0079] The cycloolefin copolymers described here have viscosity numbersto DIN 53 728 of from 5 to 5,000 ml/g. Preference is given to viscositynumbers of from 5 to 2,000 ml/g, particularly to viscosity numbers offrom 5 to 1,000 ml/g.

[0080] The optical properties of the polymer mixtures were assessedvisually qualitatively on pressed plaques of thickness 1 mm.

[0081] The transparent polymer mixture of the invention, comprisingcycloolefin polymers and having modified relaxation behavior andmodified shrinkage behavior, may particularly be used for the followingproducts. Mono- or biaxially oriented films with modified shrinkagebehavior. Products in which heat resistance has been changed from thatof the starting materials by using blends of the invention. Blisterpacks in which thermoformability has been modified by using the blendsof the invention. Mixtures with other plastics, particularly polyolefinsin which relaxation behavior, shrinkage behavior, or heat resistance hasbeen modified by using the blends of the invention. Mono- or biaxiallyoriented films for which wide processing latitude for orientation isrendered possible by using the blends of the invention. Test specimensproduced by injection blow molding, such as small bottles, for whichwide processing latitude for blowing is rendered possible by using theblends of the invention. Films produced by extrusion and blowing, forwhich wide processing latitude is rendered possible by using the blendsof the invention.

[0082] Further clarification of the invention will now be given, usingexamples and diagrams.

Example 1

[0083] 500 g of norbornene-ethylene copolymer pellets with a glasstransition temperature of 69° C, VN of 90 ml/g and Mw=120,000 g/mol(tradename Topas® 8006, Ticona GmbH, Frankfurt) were homogenized with500 g of norbornene-ethylene copolymer pellets with a glass transitiontemperature of 145° C., VN of 65 ml/g and Mw=70,000 g/mol (tradenameTopas® 6013, Ticona GmbH, Frankfurt), on a set of rolls. The homogenizedmixture was cast to an injection molding machine and test specimens wereproduced at 250° C. melt temperature. The test specimens weretransparent.

[0084] Glass transition temperatures measured to DIN EN ISO 11357-1 weredetermined on the test specimens with the aid of DSC (TAInst 2920) withheating rate 20 K/min, using the second heating curve. The glasstransition temperature (Tg) was 87° C., and the temperature differencebetween the start and center point (Tg width) was 8.3° C.

[0085] Modulus of elasticity and tan delta were determined as a functionof temperature, using a torsion pendulum at frequency 5 Hz and heatingrate 5° C./min, using test specimens of dimensions 50*10*1 mm. Themaximum of tan delta (tan d max) was found at 97° C.

[0086] A press was used to produce films of thickness 1 mm from the testspecimens. From these, specimens of 20×20 mm were cut. These films wereelongated to five times their length using an (Instron) tensile straintester, the strain velocity being 500 mm/min at 125° C., and were cooledunder tension. The change in length of these oriented films was thendetermined as a function of temperature. For temperatures under 90° C.,the oriented films were stored for 30 s in a waterbath, and above 90° C.they were stored for 180s in a circulating-air drying cabinet, on sand.The shrinkage is the change in length prior to and after storage at hightemperature, divided by initial length. The table below gives furtherexamples and comparative examples: Comp. Ex. Comp. Ex. Comp. Ex. Comp.Ex. Ex. 2 1 2 3 4 Component 8006 8006 8006 8006 8006 1 Proportion, % 75100 50 75 75 Component 6013 — Zeonor Kraton G Topas TM 2 1060 1560Proportion, % 25 0 50 25 25 Production injection injection injectionextrusion extrusion molding molding molding Transparency transparenttransparent cloudy opaque transparent Tg/° C. 80 69 70/102 68 67 Tgwidth/ 6.8 4.7 5.9 6.3 7.4 ° C. Tan d 86 73 70/102 71 71 max/° C. OrientT/ 110 90 not 90 90 ° C. possible

[0087] Zeonor 1060 is an amorphous cycloolefin polymer from Nippon ZeonCo. Ltd. (Japan) with glass transition temperature 106° C.

[0088] Kraton G 1650 is a thermoplastic linear S-E/B-S elastomer fromDeutsche Shell Chemie GmbH, Eschborn.

[0089] Topas TM is a norbornene-ethylene copolymer with glass transitiontemperature 65° C., VN of 15 ml/g and Mw=10,000 g/mol, from Ticona GmbH,Frankfurt.

[0090] The present invention is described in more detail using FIGS. 1and 2.

[0091]FIG. 1 shows the moduli of elasticity of the examples andcomparative examples as a function of temperature.

[0092]FIG. 2 shows the shrinkage of the examples and comparativeexamples as a function of temperature.

[0093] Examples 1 and 2 show the desired modified relaxation behaviorand modified shrinkage behavior with retention of transparency.

[0094] Comparative example 1 shows the known relaxation behavior andshrinkage behavior of amorphous polyolefins.

[0095] Comparative example 2 is a cloudy product which has two separateglass transition temperatures. This means that the two substances arenot homogeneously miscible. No orientation was possible at anytemperature.

[0096] Comparative example 3 is an opaque polymer mixture which showsthe known relaxation behavior and shrinkage behavior of amorphouspolyolefins.

[0097] Comparative example 4 is a transparent mixture of amorphouspolyolefins which shows the known relaxation behavior and shrinkagebehavior of amorphous polyolefins.

[0098] In order to shift the glass transition temperature, and thereforethe fall-off in modulus of elasticity and the onset of shrinkage, tolower temperatures, it is moreover possible to add plasticizers, such asphthalates, phosphates, adipates, azelates, sebacates, fatty esters,epoxidized fatty esters, citrates, low-molecular-weight polyesters, andchlorinated hydrocarbons. Compounds which are expressly particularlysuitable are high-boiling medicinal white oils, such as Ondina 9×'(Deutsche Shell), Cobersol (Cöner Benzin Rafinerie), and Enerpar (BPlubricants), which have little intrinsic color and give transparent,colorless mixtures with amorphous polyolefins.

1. A polymer mixture comprising at least one amorphous polyolefin.
 2. The polymer mixture as claimed in claim 1, comprising at least one cycloolefin polymer.
 3. The polymer mixture as claimed in claim 1 or 2, comprising at least one amorphous cycloolefin polymer.
 4. The polymer mixture as claimed in one or more of claims 1 to 3, comprising at least one cycloolefin polymer containing from 0.1 to 100% by weight, preferably from 0.1 to 99.9% by weight, based on the total weight of the cycloolefin copolymer, of polymerized units which derive from at least one polycyclic olefin of the formulae I, II, II′, III, IV, V, or VI

where R¹,R²,R³, R⁴, R⁵, R⁶, R⁷, and R⁸are identical or different and are a hydrogen atom or a C₁-C₂₀-hydrocarbon radical, such as a linear or branched C₁-C₈-alkyl radical, C₆-C₁₈-aryl radical, C₇-C₂₀-alkylenearyl radical, or a cyclic or acyclic C₂-C₂₀-alkenyl radical, or form a saturated, unsaturated, or aromatic ring, where the same radicals R to R in the various formulae I to VI may have a different meaning, and where n can assume values from 0 to 5, and containing from 0 to 99.9% by weight, preferably from 0.1 to 99.9% by weight, based on the total weight of the cycloolefin copolymer, of polymerized units which derive from one or more acyclic olefins of the formula VII

where R⁹, R¹⁰, R¹¹, and R¹² are identical or different and are a hydrogen atom, or a linear or branched, saturated or unsaturated C₁-C₂₀-hydrocarbon radical, such as a C₁-C₈-alkyl radical or a C₆-C₁₈-aryl radical.
 5. The use of a polymer mixture as claimed in one or more of claims 1 to 4 for producing mono- or biaxially oriented films, blister packs, or mixtures with other plastics, particularly with polyolefins.
 6. The use of a polymer mixture as claimed in one or more of claims 1 to 4 in injection molding, injection blow molding, or blow extrusion. 